What is the difference between overbust and underbust measurements

What is the difference between overbust and underbust measurements when it comes to bra sizes? - Quora

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Why would a bra size measurer say that I'm a 30 band size when a 34 feels too tight? My 1st post op bra, a 34, is suffocating me. - Quora

How many bra sizes are there in the world? - Quora

How to measure underbust size - Quora

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Size chart – Her own words

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Is 34D bra size medium, big or large for a 5 feet 1 woman who has 24-28 inch waist and 36 1/2 inch hip? - Quora

Bra Measuring Guide